As I view it through my own experience, habituation is when the sound you hear in your head is the sound of everday life. It is common, a normal part of living, not some extraordinary assault against you. One's perception of what is ordinary has changed, and that process, for me, began when I started to listen to tones/sounds/recordings that mimic the predominant noise in my head (I have several) over a period of years.
Never allowing myself, if I could help it, to experience silence, no matter where I was: shopping, working, walking, watching TV, doing anything, was the key. Always having sound around me and preferably the sort that mimicked what I hear in my head. My entire house used to be one big sound therapy room in the days prior to MP3 players. Even when I watched TV I had crickets playing in the background, and even when I wanted to listen to my favorite songs, crickets would be playing over them, and as little as possible would I permit the volume of my device to be above what I hear in my head.
Eventually, the hyperacusis quit bothering me, and it was then that I had only tinnitus to deal with, but my course of action remained the same. Keep sound in my life. These days, I can sit in a quiet office without having to resort to turning on my MP3 player, although it is a comfort when I do. To a great degree, I've grown to think what I hear in my head is what is normal.
My hearing is bad on both sides, but very bad on the left, which keeps me out of balance when I am without my hearing aids on. When my hearing aids are in need of repair or cleaning, I have to walk with the person who is talking to me on my right side or I won't hear them very well. On those days, there is less ambient sound around me, and so the T can noticeably heighthen, demanding I use an MP3 player, but without balance it's a challenge to get the quality of distraction I'm looking for.
I'm not a hundred percent habituated, maybe more like seventy percent, and I doubt I will ever get there, but neither am I where I was at the start of this constant symphony in my head. Also, keep in mind, I'm now forty five years older. Other health issues, mostly pain related, have developed that too often overtake whatever else might me going on with my hearing and the T, so now there exists competition for my attention.